# Mathieu NOE

### Hutchinson

Engineer - mechanices /ekectronics / signal processing

Average matlab user for 20 years now.

Professional Interests: signal processing, adaptive control, noise and vibration processing

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**Content Feed**

Data analysis from measurements (PRBS injected to a system -> how to plot the bode of the system response)

hello see my suggestion below (data in attachement) clc clearvars data = load('beam_experiment.mat'); x = transpose(data...

2 days ago | 1

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How to convert to nan

hello try this FF= [1 2 3 4 5; 6 7 8 9 10; 11 12 13 14 15]; [i,j] = find(FF > 0 & FF < 10); FF(i,j) = NaN;

3 days ago | 0

How is frequency response calculated as function of sample data frequency?

hello so h is a FIR filter see code below for Bode plot and time domain simulation on sine wave at 30 and 25 Hz (the notch f...

3 days ago | 0

Drift in cumtrapz forceplate data

hello yet another example of accelerometer / signal integration drift using cumtrapz. I see you removed the mean value of th...

3 days ago | 0

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How to find the index of the first absolute minimum entry of a matrix

hello here you are my friend A=[5,7,0.5,5 ; 2,0.5,4,1 ; 0.5,6,7,9] [val,ind_linear] = min(A,[],'all','linear'); % M = ...

3 days ago | 0

Summation with for LOOP

hello a simple add on to your code : clear clc x = linspace(0,50,1000); v = 10; a = 0.2254; b = 0.5401; xT = 0; ysum =...

4 days ago | 0

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change marker color based on the values

hello my suggestions below S = 35; % size of symbols in pixels % normalize vector to go from zero to 1 normV = (B(:,3)-m...

4 days ago | 0

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How to FFT my xlsx files from time domain to frequency domain?

hello see my demo below now your signals look like a bunch of spikes so I wonder what you expect from the fft analysis ? c...

5 days ago | 0

How to make the postions of each circle random?

hello maybe this ? - as far as I understand you simply want to generate random center position for the circles ? % Set the r...

5 days ago | 0

How do i count the signal within a certain time interval?

hello below a demo code that look for crossing point between a chirp signal. We detect both the positive and negative slope cr...

10 days ago | 0

Calculate peak of pulses above certain threshold

hello @Chunru : why the envelop ? this can create enough signal distorsion so that the peak instant is misread. I understand ...

11 days ago | 0

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Find the max width of a peak

hello Nigel maybe there is some way to make findpeaks compute the prominence in a manner that better works on this example , b...

11 days ago | 0

How to extract time period of sensor signals

hello see my demo below - for constant and non constant frequency signals. the last plot shows the time diffeence between the ...

12 days ago | 0

table import in more columns

hello maybe this will help you to get your data as you want : load('ModellDDOKLL2table.mat') C = table2array(ModellDDOKLL2t...

12 days ago | 0

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User input compared with excel sheet data and returns best fit

hello was a nice recreation task.... here a small demo (the excel file is attached) % Import the data data = readcell("CARS....

12 days ago | 0

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Curve fitting for jonscher power law

hello my suggestion - and because I don't have the Curve Fitting Tbx, simply with fminsearch i prefered to look at the data i...

12 days ago | 1

I keep getting undefined input error

hello you want to request a string not a number , so the correct code is : Grade = input('Enter letter grade for course: ',"...

12 days ago | 1

Estimation of Pitch from Speech Signals Using Autocorrelation Algorithm

hello this is a modified version of the code . The autocorrelation ouput will have a major peak at sample = M (x axis) and is ...

13 days ago | 0

How can I create a for loop using simulated data for the start of frequency analysis?

hello see code correction below ; there is only one for loop as we add the new signals on the 60 Hz + noise signal created bef...

13 days ago | 0

How To Approximate Data With Model

hello maybe this ? clc clearvars realdata=readmatrix('RATM.csv'); Year=realdata(:,1); realgA=realdata(:,2); TFPmodel...

13 days ago | 0

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Content and rate of change in a buffer

hello IMHO, the non uniform x spacing is prone to bug - so I prefered to resample the data with constant x spacing . Now I w...

13 days ago | 0

How to use readtable when skipping every second (non-data) line?

hello try this T = readtable ('samplefile.txt', 'NumHeaderLines', 8,"Delimiter",' '); [m,n] = size(T); select_rows = 1...

13 days ago | 0

how to obtain the impulse response of halfband FIR filter

hello by definition H1 array is your impulse response (a FIR filter coefficients array is its impulse response) clc; close...

13 days ago | 0

This code shows the FIR filter magnitude response with the normalized frequency from 0 to pi, how i can make mirroring of this magnitude response to start from -pi to pi ??

hello here you are (nothing fancy !) clc; close all; clear all; n1= 15; %order Fs= 100; %sampling frequency fc= Fs/4; %c...

13 days ago | 0

getting an error in this code

hi here you are sx = (1:8); px = [0.15*ones(4,1), 0.1*ones(4,1)]; gx = (sx<=5).*(105*sx-5*(sx.^2)) + ((sx>5).*500); sy = u...

23 days ago | 0

How to constraint the values of fitted parameters with lsqcurvefit?

hello I admit, my solution is the "poor man" solution as I don't have the optimization toolbox. But even with fminsearch I cou...

24 days ago | 0

How to calculate the width where the intensity is higher than 20% of the maximum intensity?

hello Angelo I have no doubt you can use findpeaks but sometimes I prefer my own way. see demo below - this is to find W20...

24 days ago | 0

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how harmonic estimation using DFT ?

hello yu can take example on the code below (averaged fft spectrum and spectrogram (this my not be your main focus right now))...

24 days ago | 0

Math Moron here in need of a function to simulate a degrading curve over time.

hello maybe this ? (the idea behind is a sigmoid) samples = 100; c = samples/2; % center of the curve (c corresponds to ...

24 days ago | 0

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How to extract column in particular interval from original matrix and to form new matrix?

hello I guess you mean you want to downsample your data by a factor 4 ; you can of course simply pick one every four sample , ...

24 days ago | 0